/Engine/Plugins/Experimental/LandscapePatch/Source/LandscapePatch/Public/LandscapeTexturePatch.h
Bydefault, the layer is added with source mode set to be a texture-backed render target.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=LandscapePatch) virtual void AddWeightPatch ( const [FName](API\Runtime\Core\UObject\FName) & InWeightmapLayerName, [ELandscapeTexturePatchSourceMode](API\Plugins\LandscapePatch\ELandscapeTexturePatchSourceMode) SourceMode, bool bUseAlphaChannel )